individual throttle bodies?

[ironworks]

Hay Scott is that 16 injectors or just 8. It looks like a fuel rail under the carbon stacks.

[camcojb]

I ran a modded Hilborn setup on a small block, idled great, ran awesome.



Jody

[camcojb]

Originally Posted by deuce_454

the fuelrails are inboard between the banks and the alcohol lines are for the MAF if you were wondering... (im considdering not running the MAF and doing the load tabels based on TPS instead.... any input on this???)

I'm assuming you meant map, not maf. I wouldn't run it in alpha-n (no map, just tps and rpm)...........some race guys do it, but you lose a ton of driveability and tuneability in my opinion. It will run, but no allowance for elevation, weather changes, temp changes, etc.

[GregWeld]

What's all this "stack" up to?? LOL

This is my 427 Dart Small block - with IMAGINE INJECTION... no IAC... fires up in less than two revolutions - Idles perfectly without any help from dead cold... instant throttle response - tons of torque... And besides - it's bitchin' and different!

[legend]

any thoughts on how the engines compare with a similarly specced motor on a plenam intake?

[deuce_454]

Originally Posted by camcojb

I'm assuming you meant map, not maf. I wouldn't run it in alpha-n (no map, just tps and rpm)...........some race guys do it, but you lose a ton of driveability and tuneability in my opinion. It will run, but no allowance for elevation, weather changes, temp changes, etc.

i did infact mean alpha-n... the reason i came up with the idea is that it seems that when the manifold heats up the two banks move ever so slightly in reference to one another... so it wont get even air distribution as the throttleshafts are conected.. one bank will close and one open slightly... i have also considdered drilling holse in the throttle blades to make the airflow changes arround idle less hysterically dependent on infinitesimal throttle angle changes....

and could i feed the IAC metered air thru the same lines as my MAP-sensor is reading?? perhaps add a vacuum reservoir to act as a "shock absorber" and give a more even MAP reading

[legend]

you may be better off with snail cam style linkage that opens the throttle proportionally less around the closed position.

propably be some bmw m5 parts that could be used

[GregWeld]

Originally Posted by deuce_454

i did infact mean alpha-n... the reason i came up with the idea is that it seems that when the manifold heats up the two banks move ever so slightly in reference to one another... so it wont get even air distribution as the throttleshafts are conected.. one bank will close and one open slightly... i have also considdered drilling holse in the throttle blades to make the airflow changes arround idle less hysterically dependent on infinitesimal throttle angle changes....

and could i feed the IAC metered air thru the same lines as my MAP-sensor is reading?? perhaps add a vacuum reservoir to act as a "shock absorber" and give a more even MAP reading

Deuce -- You're way over thinking it... and before you've even installed it... or run the engine... I'm not flaming you here, please don't take my comments as 'mean' or ill intentioned.

Most of the systems out there have already taken throttle linkage movement and heat changes etc into consideration and have designed appropriate solutions.

Don't treat the throttle blades to your old skool carb fix - ala - drilling holes in them...

I was just down at WW Hot Rods listening to the 950 hp 8 stack system in the 32 Ford they built for a customer... it fired in nano seconds and didn't need so much as a blip of the throttle to fire and idle. In fact - Scott started it from outside the car by just reaching in and turning the key. Trust me when I tell ya - this motor was a beast!

One thing that these manifolds do really well -- the total elimination of REVERSION in the intake. This (I've been told) helps "eat" a big cam

[GregWeld]

@ Deuce

Using a SMALL plenum for the vacuum is a requirement - not an option - otherwise you have nowhere to take the MAP reading. There is very very little vacuum signal from these types of intakes. I would advise you to use the plenum for ONLY the MAP signal. I was trying to remember - but think I could only get 4 or 5 inches of vacuum reading at my plenum. The pulse signal is soooooo weak without having a large common plenum of the dual plane / single plane intake....

To help tune the idle circuit -- in the efi maps -- you make smaller incremental
grids in the idle vacuum and rpm map.... then you can tune out the lumps easier with finer control... and also using the idle spark add or subtract.

IMHO, a guy that's GOOD with these ECU EFI systems can make anything/combo run like a swiss watch.

I just finished helping a buddy with his 8 stack (Imagine Injection) install - using Fast XFI on his 454 big block. It started the FIRST TIME - in about 3 rev's - once I tweaked the distributor timing to actually match the ECU - it purred... and there's nothing like the sound of air being gulped one cylinder at a time.

[camcojb]

Originally Posted by deuce_454

i did infact mean alpha-n... the reason i came up with the idea is that it seems that when the manifold heats up the two banks move ever so slightly in reference to one another... so it wont get even air distribution as the throttleshafts are conected.. one bank will close and one open slightly... i have also considdered drilling holse in the throttle blades to make the airflow changes arround idle less hysterically dependent on infinitesimal throttle angle changes....

and could i feed the IAC metered air thru the same lines as my MAP-sensor is reading?? perhaps add a vacuum reservoir to act as a "shock absorber" and give a more even MAP reading

go speed density. For the map signal, you need a vacuum feed from each port, tied into a common "metering block" and then to the map sensor. You cannot take a vacuum signal from a single port, needs to be from all of them. You also don't want to share that vacuum source with the iac or anything else. They make nice remote mount iac's, but again they need their own separate lines to each port. Think of something like a port-injected nitrous system with the stainless hard lines going to each port in the intake and tieing together in a billet aluminum block. On mine, there were two lines to each port hidden underneath the manifold just like a hidden nitrous kit. Then after the block where they came together we put two bulkhead fittings in the rear of the intake (one for iac and one for map) so there was a connection from the top of the intake. Totally hidden, very clean looking and works perfect.

Jody